Boiler furnace



April 8, 1930. A. c. MOTT, JR 1,754,176

BOILER FURNACE} Filed March 4, 1927 2 Sheets-Sheet l April 8, 1930.

A. C. MOTT. JR

BOILER FURNACE Filed Mrch 4, 1927 2 Sheets-Sheet I 2 Patented Apr. &, 193d TATE earner cri ics ABRAM C. MOTT, 31%., F LANSDALE, PENHEYLVANIA, ASSIGNOR TO COX CO1VI- PANY, OF LANSDALE, PENNSYLVANIA, A UORPGRATIUIJ OF PENNSYLVANIA BOILER FURNACE Application filed March 1, 1927.

My invention relates to certain improve ments in a sectional boiler having a tongue projecting over the fire-box of the boiler. In this type o1 boiler the products of combustion pass up between the tongue and through horizontal tlues to the stack.

T he object of my invention is to provide means for admitting air to mix with the prod nets of combustion as they enter the space between the tongue, to increase combustion and to reduce the amount of smoke escaping to the fines.

1n the accompanying drawings:

Fig. 1 is asectional view on the line 11, Fig. 2, of a vertical boiler of the building heating type and illustrating my invention;

Fig. 2 is a sectional view on the line 2 2, Fig. 1;

Fig. 3 is an end View ot a portion of the boiler showing the end cover plates;

l is an enlarged sectional View of the air intake duct on the line ll, Fig. 6;

Fig. 5 is a sectional View on the line 5 Fig. 6; and

Fig. 6 is a side View partly in section of the air duct.

The sections 1 of the boiler are mounted upon a base 2 having bea *ings for tilt} trunnions of a grate and enclosing the ash-pit. 'lhe boiler sections 1 are made as shown in 1 and 2, each section having an overhead body portion 3 with channels in the sides forming flues l tor "the products of combos tion, a back leg 5 forming the back of the fire-chamber 6 and tongues 7, which depend from the body portion and are located direct- 1y above the firechamber. The boiler just described is of a standard type.

In order to increase the eiiiciency of the boiler and to prevent, to a great extent, the escape of smoke from the boiler, air is ad mitted to the boiler. This air mixes with the products of combustion before the products enter the fines ot the boiler.

ln order to admit air at theproper point, the tongues 7 of the boiler sections are perfo rated at 8 (Figs. 1 and 2). The shape of the perforations is as shown in said figures.

A. transversely arranged intake duct 9 is provided, the duct being made as shown in Serial No. 172,894.

Figs. 1, 5 and 6, and is so shaped as to rest in the perforations ot the tongues oi the boiler, as in Figs. 1 and 2.

lhe duct is made in three longitudinal sections 10, 11 and 19. in the present instance, and these sections are of a given len th. Two or more len ths may be coupled together where the wnxth out the boiler requires such arrangement.

The section 1 is the bottom section and is preferably shaped in cross-section as in Fig. 4t, s as to firmly on the bottom of the per- -Zorations 8, the sides of said section 10 being arranged an angle and terminating a short cance from the lower edge oi the vertical side sections 1 and 12, forming a narrow passage for air to be drawn into the combustion chamber from the duct 9.

The two side sections 11 and 12 are preterably curved at their upper edges, and one section overlaps the other section as shown in Fig. l to term a substantial joint at this point. The two parts are held together by transverse bolts 13 5 and 6).

In order to secure the bottom section 10 to the side sections, the latter have projecting lugs 14 atintervals, and the bottom section also has lugs 15 aligning with the lugs 1%, bolts 16 extend through slots in the lugs 14. and holes in the lugs 15. The lugs 15 ot the bottom are so shaped to proper separate the bottom section from the side sections, leaving slots 22 of proper width for air to pass from the duct to the combustion chamber or the boiler.

As stated above, the duct is made in a number of longitudinal parts depending upon the width of the boiler, the bottom section of one part abutting against that of the other part. One end of the side sections has flange 17 which overlaps the end oi the adjoining section, as shown in Fig. 6, the parts being held together by transverse bolts 18.

In order to close the opening in each of the side sections of the boiler between the duct 9 and the body of the section, a double cap-plate 19 is securedto each side sectionbyscrewbolts 20, Fig. 3, and the two parts of the cap-plate are secured together by bolts 21 which pass through lugs on the parts.

I claim 1. The combination in a boiler furnace, of a base; a series of boiler sect-ions arranged side by side, each section having a body portion extending over a combustion chamber and having a rear depending portion, said depending portions forming the back of the combustion chamber, each section having a flue directly in front of the rear depending portion and having transverse perforations in the walls of the overhanging portion communicating with an intermediate portion of the flue; and an air duct extending through the transverse perforations from side to side of the boiler, said air duct having a slot at each side to allow air to pass from the duct to the flue of the boiler furnace.

2. The combination in a boiler furnace, of a base; a series of boiler sections arranged side by side, each section having abody portion extending over a combustion chamber and having a rear depending portion, said depending portions forming the back of the combustion chamber, each section having a flue directly in front of the rear depending portion and having transverse perforations in the walls of the overhanging portion communicating with an intermediate portion of the flue and air duct located in said transverse perforations, said air duct consisting of a base section and two longitudinal side sections; and means for holding the sections in the assembled position, the base section being spaced from the lower edges of the side sections, to allow air to pass from the air duct to the combustion chamber oft-he furnace.

3. The combination in a boiler furnace, of a base a series of boiler sections, including two side sections and a series of intermediate sections, said side sections forming the side of a combustion chamber, the intermediate sections having tongues extending over the combustion chamber, the several sections being shaped to form flues extending from the combustion chamber, the tongues having transverse perforations communicating with an intermediate portion of the flue; an air duct extending from one side of the boller furnace to the other side and through the perforations in the tongues consisting of a base and two side sections, the base being spaced from the side sections to form narrow air passages; bolts securing the parts together, the duct being made of longitudinal sections secured together, said duct-sections extending through the side boiler sections; and cap plates surrounding theends of the duct and closing the space not occupied by the duct.

ABRAM O. MOTT, JR. 

